不同焙烧温度对Ce-Mn/鸡蛋壳催化剂脱硝性能影响

The effect of calcination temperature on denitrification performance of Ce-Mn/egg shell catalyst

采用废弃物鸡蛋壳为载体,通过浸渍法制备鸡蛋壳负载Mn和Ce催化剂(Ce-Mn/egg)。利用XRD、SEM和H_(2)-TPR对催化剂进行了表征。此外,考察了不同焙烧温度对负载型鸡蛋壳催化剂在NH_(3)选择性催化还原NO_(x)(NH_(3)-SCR)反应中的催化性能的影响。脱硝结果表明,当焙烧温度为300℃时,所制备的Ce-Mn/egg脱硝催化剂具有较好的活性(脱硝反应温度为250℃时NO_(x)转化率为65.3%),这可能是由于活性组分分散较均匀。此外,催化剂中Mn^(4+)+Ce^(3+)→Mn^(3+)+Ce^(4+)的氧化还原循环也有助于提高催化剂的脱硝性能。

The waste egg shell supported Mn and Ce catalyst(Ce-Mn/egg)was prepared by impregnation method using egg shell as carrier.The prepared catalysts are characterized by XRD,SEM and H_(2)-TPR.In addition,the effects of different calcination temperatures on the catalytic performance of the supported egg-shell catalyst in the selective catalytic reduction of NO_(x)(NH_(3)-SCR)reaction are also investigated.The results exhibit that the calcination temperature is 300℃,the prepared Ce-Mn/egg denitrification catalyst has a good activity(when the denitration reaction temperature is 250℃the NOx conversion rate is 65.3%)due to the uniform distribution of the active components.In addition,the redox cycle of Mn^(4+)+Ce^(3+)→Mn^(3+)+Ce^(4+) is helpful in improving the denitrification performance of the catalyst.